cve/2023/CVE-2023-49290.md

### [CVE-2023-49290](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-49290)
![](https://img.shields.io/static/v1?label=Product&message=jwx&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3D%20%3C%201.2.27%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-400%3A%20Uncontrolled%20Resource%20Consumption&color=brighgreen)

### Description

lestrrat-go/jwx is a Go module implementing various JWx (JWA/JWE/JWK/JWS/JWT, otherwise known as JOSE) technologies. A p2c parameter set too high in JWE's algorithm PBES2-* could lead to a denial of service. The JWE key management algorithms based on PBKDF2 require a JOSE Header Parameter called p2c (PBES2 Count). This parameter dictates the number of PBKDF2 iterations needed to derive a CEK wrapping key. Its primary purpose is to intentionally slow down the key derivation function, making password brute-force and dictionary attacks more resource- intensive. Therefore, if an attacker sets the p2c parameter in JWE to a very large number, it can cause a lot of computational consumption, resulting in a denial of service. This vulnerability has been addressed in commit `64f2a229b` which has been included in release version 1.2.27 and 2.0.18. Users are advised to upgrade. There are no known workarounds for this vulnerability.

### POC

#### Reference
- https://github.com/lestrrat-go/jwx/security/advisories/GHSA-7f9x-gw85-8grf

#### Github
No PoCs found on GitHub currently.